code: def T(s):
      """
      Helpful function to improve readibility.
      """
      return Timestamp(s, tz="UTC")
  
file_path: catalyst/tests/utils/test_date_utils.py
imports: from pandas import Timestamp
  from nose_parameterized import parameterized
  from catalyst.testing import CatalystTestCase
  from catalyst.utils.calendars import get_calendar
  from catalyst.utils.date_utils import compute_date_range_chunks
label_desc: Use image node_id 1 for calling a global function with example usage: T(s) and returns: Timestamp